Dunes

Question 1

Hesp, 2011

Answer 1

• 4 types
• Requirements (supply, threshold)
• Type of dune (foredune, disturbance= blowouts and parabolic)

Question 2

Houser and Ellis, 2003

Answer 2

• Requirements (fetch, vegetation)
• Entrain occurs when…
• Stoss and lee

Question 3

(Wolfe and Nickling, 1993)

Answer 3

Even a sparse vegetation cover will weaken the power of wind, shelter the ground surface and trap sand grains.

Question 4

Prevailing wind threshold

Answer 4

An onshore prevailing wind of at least 4.5 metres per

second.